A first tonic clonic seizure is a frightening experience. It is a generalised seizure, which usually lasts less than three minutes. This type of seizure is known to cause confusion, headache, and even bruises on the legs.Tonic clonic seizures are a part of the epilepsy syndrome. The seizures are caused by metabolic disturbances. They are also caused by direct trauma to the brain.First tonic clonic seizures can present as simple partial seizures or complex partial seizures. Some people also experience a "deja-vu" or sudden fear. In order to get an accurate diagnosis, you need a thorough history and physical examination.If you suspect you or a loved one is having a tonic clonic seizure, call 911. Also, write down as many details as you can about the seizure. These can be helpful for guiding treatment.For a more accurate diagnosis, you should have an EEG or a high-resolution MRI done. Your doctor may also need to perform a toxicology screen. However, this is not always necessary in an office setting. Emfit NZ The main reason to seek treatment is because of the risk of recurrence. Studies show that the risk of recurrence after a first tonic clonic seizure can be as high as 30%. Assuming no risk factors, this is a compelling reason to begin treatment.Antiepileptic drugs are prescribed to reduce the risk of recurrence. Choosing the right drug for the patient should include considerations of long-term safety and tolerability. Drugs that have good efficacy, low interaction potential, and are not accompanied by cognitive side effects should be used.